Definition
Web Serial API defines SerialOptions
dictionary SerialOptions {
[EnforceRange] required unsigned long baudRate;
[EnforceRange] octet dataBits = 8;
[EnforceRange] octet stopBits = 1;
ParityType parity = "none";
[EnforceRange] unsigned long bufferSize = 255;
FlowControlType flowControl = "none";
};